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2014-04-11T19:50:38+03:00
X*x=1+1+2+1+4+..+1+100
x*x=50+2+4+...+100
x*x=50+2*(1+2+3+..+50)
x*x=50+2*50*51/2
x*x=50+50*51
x*x=51*51
x=51
2 4 2
2014-04-11T20:01:39+03:00
X*x=1+2+3+...+101+102-2-4-6-8-...-102
x*x=102*103/2-2(1+2+...+56)
x*x=103*56-2*56*57/2
x*x=103*56-56*57
x*x=56(103-57)
x*x=56*56=>x=56